You clearly have no idea what you’re talking about if you say the F35B is the most sold F35 variant. It’s the F35A*.

It’s also STOVL, not SVTOL. You slapped an S in front of VTOL instead of thinking about what the acronym really means.

*From f35.com - Designed to operate from conventional runways, the F-35A is the most common variant operated by the United States Air Force and most international allied customers.